7721 datasheet(206/577 Pages) RENESAS

Part #	7721

Description	16-BIT SINGLE-CHIP MICROCOMPUTER

PDF	577 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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SERIAL I/O

7721 Group User’s Manual

11–3

11.2 Block description

Figure 11.2.1 shows the block diagram of Serial I/O. Registers relevant to Serial I/O are described below.

11.2 Block description

RxDi

Data bus (odd)

Data bus (even)

UARTi receive register

UARTi receive

buffer register

UARTi transmit

buffer register

Receive

control circuit

Transmit control

circuit

1 / (n+1)

1/16

1/2

BRGi

Clock synchronous

(internal clock selected)

UART

Clock

synchronous

UART

Clock synchronous

(internal clock selected)

Clock synchronous

(external clock selected)

Data bus (odd)

Data bus (even)

TxDi

Transfer clock

CLKi

BRG count source

select bits

CTSi / RTSi

UARTi transmit register

n: Values set in UARTi baud rate register (BRGi)

Clock

synchronous

D8 D7 D6 D5 D4 D3 D2 D1 D0

f16

f64

f512

D8 D7 D6 D5 D4 D3 D2 D1 D0

Fig. 11.2.1 Block diagram of Serial I/O

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